Zoom lens and image pickup apparatus including the same

An image pickup apparatus, comprising:

• a zoom lens comprising, in order from an object side to an image side:
• a first lens unit having a positive refractive power;
• a second lens unit having a negative refractive power;
• and
• a third lens unit having a positive refractive power,
• the second lens unit being configured to move toward the image side during zooming from a wide angle end to a telephoto end, an interval between adjacent lens units being changed during zooming,
• the first lens unit comprising a lens pair (LB1) of a positive lens (LP1) and a negative lens (LN1) that are arranged adjacent to each other,
• the following conditional expression being satisfied:
• 0.000<(θIRP1−IRN1)/(νIRP1−νIRN1)<0.015
• where, when a refractive index of a material at a wavelength of 400 nm is N400, a refractive index of a material at a wavelength of 1,050 nm is N1050, a refractive index of a material at a wavelength of 1,700 nm is N1700, an Abbe number νIR of a material and a partial dispersion ratio θIR of a material are νIR=(N1050−1)/(N400−N1700) and θIR=(N400−N1050)/(N400−N1700), νIRP1 and θIRP1 represent an Abbe number and a partial dispersion ratio of a material for the positive lens (LP1), respectively, and νIRN1 and θIRN1 represent an Abbe number and a partial dispersion ratio of a material for the negative lens (LN1), respectively;
• and
• a solid-state image pickup element configured to receive light of an image formed by the zoom lens.